import turtle
ablak = turtle.Screen()
teki = turtle.Turtle()
teki.speed(0)
szin = ["red", "blue", "yellow", "green", "black", "purple", "orange", "cyan", "grey", "pink"]
oldal = 30*4*2
for i in range(30):
    teki.color(szin[i % len(szin)], szin[i % len(szin)])
    teki.begin_fill()
    for j in range(4):
        teki.forward(oldal)
        teki.left(90+1)
        oldal = oldal-2
    teki.end_fill()
ablak.mainloop()